Thermostatic lamp dimming pull socket



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May 22, 1923.

R. D. ESB/HTH THERMOSTATIC LAMP DIMMING PULL SOCKET Filed Nv, s,

E14/wm gum/165i@ 5mm 5 monivealth of' lilassachusett l Patented May 22,i923.

UNITED PATENT OFFCE.

Application ned November T0 all w71 om. t may concern Be it lrnown thatl, ltnxonn D. Samir, a citizen of the TJnited States, residing atMilton, in the county ot Noi-toll; d Qomhave invented a nevv and useliulThermostatic Lan'ip-liniming` Pull Socket, ot which the following' isspecification.

This invention relates to improved sock- 10 ets and particularly pullsockets, incorpo ratingw in novel and advantageous combination aplurality et different and convenient light-controllinze,` functionsthat in ilne'-r-,rred form are selectively available by the userJthrough actuation ot the usual pull chain.

ln general the object et the present invention is to provide alamp-socket, (and. specifically though not exclusively, a 5 socket)having` a greatly increased. i'ield usefulness in its control ot boththe 0c and periodicity of illumination prv'idt the usual incandescentlamp thi-ou. above mentioned novelly combined eatu' ot sivitchunctiom-such features in the strokes on the single sivitch-opeiatinrg`pull chain, selectively and respectively to switch into and out otcircuit the usual incandescent lamp of desired candle pow r for Sullillumination and to switch into and out of series with this lamp aresistance unit compactly arranged as part of the socket svvitchstructure and for continuous duty when desiree, this unit operating todim the lamp when switched into circuit therewith; and also the ability,when through With the lig-ht to operate the switch to causethermostatically delayed, automatic e'rtinauish ment or" the lamp anappreciable interval ot time ai'ter actuation ot the pull el n, so thatfull illumination may be had tor leaving; the premises.

A. specific object @t the present invention is so t0 construct andlocate the lamp-dim mingv resistance unit Within the socket switchstructure that an outer telescopically enclosing casing may be employedusual and properly formed to support the interior socket-switchstructure in the usual manner, i. e., by shoulder engagement with 'thebv tom insulating` switch base, such ca o' being?` 'further suitablyformed to ready dissipation to the atmosphere ot he' per l Massif" ieee.

ASSGNOR TO TREMONT PRODUCTS o, A COPORAION OF IVIASSACHUSETTS.

VMNG PULL SOCKET.

Serial No. 421,55.

may not accumulate in the socket-switch structure to the impairmentthereof, or of the lamp base.

A. further object is to provide a simple arrangement otlswitch-controlling mechanism which shall render the su'itch selectivelyopcrable manually to a maximum degree, and specilically but notnecessarily, so that coneecutive l'ull pulls upon the switcheoperatingchain shall operate alternately to light and extinguish the lamp in theusual inanncr, but so that either ot the heretofore described speciallight-controlling` switch Yfunctions are available at Will through lessthan a tull actuating' stroke upon the pull chain.

@ther objects reside in the retention, in my improved pull-socket, ofsubstantially all the important and advantageous lfeatures of modernconventional socket-switch n and construction, so that any new partsemployed for producing` the new tune-tions are readily adaptable foretlicient production through the usual processes ot socket manufacture.Such features include the method of securing` the stationary inclinedcontact plates to the insulating socket base; the structural arrangementof the socket structure as a Whole, and the man ner oit incorporatin Q,therein the lamp-dimiun'ig resistance unit so that maximum etliciencyand simplicity of assemblage together with ready accessibility foradjustment oit the main svvitch-operating spring .is had; and alsoinclude the structural means by Which proper circuit connections throughthe svfitch are securely made through the clamping' ot the severalinterior lead terminals to the insulating' socket base, suchconstruction avoiding); all requirementtor soldered connections andensuring` uniformity and permanency in the finished product.

For purposes of illustration only, .the present improvement is disclosedas embodied in an adapted type ot pull socket as appears in theaccompanying drawings in ivhich- Figli. l is a plan view of my improvedpull-s clret With casing" and upper insulatingr cap omitted and ce tainparts shown in section for clearness, the position oit the switch being'that in which the main lamp aio/e is operatively supplied with current.

2 is a vievv in front elevation, showllU ing the complete pull-socketswitch, with the casing and certain other parte brelzen une to showv theinte 'ior parts.

Fig: 3 is a diag/rem or electrical connutions. The mechzniicul partsrepresei'itc l therein appearing` in merely arbitre positional relation.

Fig. Llis an enlarged View of the current i chine' parts, looking' indirection of Fig. l, and showing; the rotor flengnge the detent lio/oli.

s :r pin-tiel View' in e eration loolfs ine' the right 0f Fig. Q, n'itlaway.

ln the drawings, e slug ieerieg in more than one y I 1 hr the ,funereference num lMy improved soclfeIV cor es usuel` en insnl ,l i Ysuluted hase ll. held hy screws to tricelly insulu te the supply leedlneclets 'l former ot which is in clectricui. conte. the threadedreceptacle l? ior 'the :n1 67 through the holdingI sci-euv lf3 t Thecentral verti el pivot stud udjustehly seated in recesses Y Formedrespectively und centrally in the i isuluting cup and hase7 undpiifotulljiY carries the usuel one tory segginentery uctuutor 2l, thecoller; spring' F22 for rotutively returnirfi' the latter ritter itsstroke, and the double-ended c ductiye rotor all olt these per axiallyslit ehle upon the insulated stud 2O and ipressed axially downnerllydetente i l thereon against inclined A on the insulating bese l hy theaxial i i sion in said spring 22 es .in the common 'form et pull-socketswitches Well known in the zirt. The present iriinoyeinenf; plates theaccomplishment ot the cited ol jects principally through the reurrfi ofstationery Contact plates ce. 'ricd on the inclined 'faces ot seid deteii which the rotor 95)-, Spring; Q9, to .ineke e! ,t

A reed;v nnderstuntline; ot t.; this renrrencjeznent oi'i Contact liesthe had through coinpirison tlieren conter corresponding; Contact platesin t conventional type ot' mnle-undhr socketswitch. In the er type it isWell known to tl ose skilled I j, that the circuit is controlled throuohthe con over diametricully opposite und sir. i er l clined contactcarrying; tlc-ent er steps being; generally oli' 900 cire 1 und tour innumber7 and u pair ot A steps carrying' Contact ple-,tes connecter,suitable circuit terinii els Y or connecting` tlie tively bridged hy therotor erns. rlso iii ne familiar switch construction just dei, it iswell lrnoivn that eecli ol said nt steps terminates in abrupt insuinfgshoulder lorined on the lnsurutnie' buse, to prevent retrogressirenurfcment o the rotor erms Q5 between steps.

in rigs. l und i, or ic einem, ,om such iiiil:itiii;'j step should-ersSi@ uppeur 1n i i, i

equally spaced relation these shoulde' icing' understood to occupyv :inos on rt we to vthe heretofore descrihed .f-irrltch perte sulstuntiillythe seme us in the simple convenionsLY ilu-ler, i ype ot pulluiocliel'cli lietore mentioned. iis construction rise to Ythe usuel operutuniv`i. c.. that :acti rior (Yl'uch is normulli' po tioneil zig-'einst stopdep udine' tri' AAet l5 l siriuuuej more-nient und is free .tor linuty dthe dunner stop e .t poss Y tlv more thun QO the hitter lu-Ltirrllj' thecirculer o? step shoul- 30 so that l'ull t 'ir :it curl;

utc, which.

teni', stepsn (snecficully in t 1e simple ii socket suitcln ere hlunli)are. i in hulres., and two edditionfxl interiiuzhu'fje insulating'shoulders l-l1 35K :ire termed. thu

producing ined dcteiit st oi" @ech or" the seid orijrinfxl lzlfinl: c

rhus there ere in my iinprorcd ,an

iuot contact carie-ring steps fitr "li ci" 91?" t circulsnlj-*sepfiriited hf.' tiro i :1, ot os o l of which lutter pairs`minorislileul und the other wir s 04;. i 35. c additional contact ph Theiftriczrl connecticvisl o'." cnrricc i Acli Aeil contact nl we wfrlirf4troni it heine' 'ioeil thut supply circuit contact #lfl e 35` .sint lf3on one side ci t. single conti ct plete fl-l short sten 3y, und that "heoppizisite two e contacts 42 end lll occupy o hase und lop rispecti'elyoi" the other detent step Contacts #l0 and "3 eli-ch terminate dir.-n'ietricelly opposite euch other und :rt uppermost portion` in the:innulur Atoruwtion shown in l. Where the end ot the wiper erm shfnn ushui-'ine rotutirely irsswl the upc): oi summit ot this :uipjulurtorrent-ion. and is positioned on the slopinf' terminal of Contact to hedische therefrom lijf the @nel tension in sprin The (let/ent hool:however, ispivoted on the hase inouniY stud 4:5 und is nornrillrpositionezl to intercept one ot the tn'o sp* Wiper ernis .Vhcn the endoiE either o1" thu-1e 'their scribes above.

ifisaes arms has reached the rotative position shown in Fig. thereby toprevent further rotative travel ot the arin relative to the Contactplate 43 which further travel is necessary for permitting its tensioncaused discharge r'oni the sloping' Contact teriiiinal as derlhe saiddeteiit hook is held in its interceptinpv position by insulatedpinand-slot engagement therewith of the free end of a flexing',bi-inetallic thermostat 50, mounted at its opposite end on the bracket13, so long as the former is normally cool, and until the thermostat 50(which carries an insulated heating resistance winduro` 5l electricf hyeoinccted to be energized only in the position ot the rotor shown iu`lig. l) is heated by the current and i'leles outwardly to retract thehooiroin the path or suur il@ and j ieriiiits the wiper arins Q5? e:reed siiiiultaneoiu v desc l and l() to breah the circuit through theiiiain lanip.

ln t Y pre e l utilize is a resistance unit tor the lain).1 a fineresistance wire w a separate metallic hell 533 and therefrom by a hiyer54'1- ot iniea. papermy refractory eeinent7 or other suitabl' materialas desired. i siinilar oe auplied to eo layer 55 inay l ance wire 52 antprot-ect the l L A it desired. ina mould a s efr-nient. The she theresistance wire is wenn( su rounds the usual lai ll 53 on which -i l@opta-cle? being' siiiiciently grentz n d eter7 however, to provide agenerous air space between the shell and receptacle to aid in thedissipation oli heat, Th tacle l? and shell are both secure bottonisurface oit the lower insoluti* il by means or iiaiiges such as sho :i

in Fia'. il, this particular flange being' held by and iisulated fromthe screw o b acket l5.

rlhe electrical connections switch as' indicated di;V 2E are producediii the flue end ot' the lamp-dini wire 59, has terminal ioil lead 4' toard clamped beneatln e l G() which screw also holds the e 4l on detentstep 3;.

eng'

ioil lead 59 elaniped ben bracket i3 in contact w terminal contacttongue il in electrical Contact with the ot contact 442 is one end 7l otlead I`roin the thermostat resist 5l, the other end of which windingconnection lead T0 extending` to leneath the head of a screw 72, that ina manner similar to screw G0 l'rinly holds conta :t 48 to theinsulatina` base ll. und properly positioned a connection winding' ondetent step 3G. Suitable insulation 73 insulutes the bell-iiioutlibracket 13 i'roin all nietallic lead conductors that are clamped betweenit and the base ll. llie long contact plate l() occupying detent steps255 and 3G, is extended to be claniped beneath aud in electri 1al.contact with the supply lead bracket l5 in the usual and well l noi-.rninanner as clearly shown in Fig.

My iiiiprored switch operates as follows:

ln Fig'. .l the rotor 23 is shown in a position bridging` and electrirally connectingcontacts fil) and '-l. Current is thus supplied directlyto only the VLuinp which is thus c l tor continuous operations at V'ull`e lain)7 a 'l e--lwith rotor ariu such :telt by the hand oli be desiredto cai'lse deit, the chain is then reremains in its arrested i ,y .sedby the tlierniostatic i Tt it is de- Lbed. ii

ef Jshuicnt :fiction as h i to produce a retrait-r .naf "J i( l eli when't e latter 'fr n l ".v En. le +1 Y L is suon/el creat g Sri ons nust,JV the spul 'ht is now and the iper arris occupy a ,1' La i i'oieaierli b; o `en lines in :A is

rllhe oA #rr tire effect etx the i tin tion t e pull chain [5 is alsooptional. il, hill` stro f on the chain sul'lices to rotate tl i: fpbridgiiie con acts l() e id il, in rf ich position the la p-d' iino,resistance and lauip 6,7 are conneeteil in iectrical seri-5s to thesupply circuit which ises niaiii lamp to burn dinily;----or a l strokeou the chain advances the wiper i `i 'ts operative position shown inlling. l` .rliere the main laiun alone is energized and ,liurus at lullbrilli cy.

lti l' s thus evident that consecutively Vful l'es upon the chain willoperate incre ight and ly the iiiain lauip in 'i suitable pan e i 2i)ull chain the opera tire eilects l l heint (t tu laiup si d ot dirnn ipmay be secured ectiyely at their respecti re places ii the cycle ofoperative nioreinen lt will uncerstood, however, tha no restrictions areintiiided to be imposed upon niy invention through illustration oii iliiparticular sequence ot' operation. The sel ouence with i hich theseoperations may be had` merely a matter of choice in predeterminedarrangement; also, it will be apparent to those skilled in the art, thatin adapting my herein disclosed invention to coiniiercial use, theprecise a 'rz ngement disclosed may readily be varied so that delayedautonnitic actuation of the switch may be had to produce switch movementfrom any stage to any other str e,-and not only from ilnlly lighted tooxtinguishment, as I have specilically shown the chosen construction tobe erranoed. ny such modification is a mere m er of choice inarrangement.

A. curved chair guard 'ii' shown exten ding 'from and secured to thebracket ti and naiv lie if. bre or other sui le ma tcrial tor ii .ilathe live parts troni ental Contact by the pull chain T5. or

eier moving parts that must be insulated.

`loiiventional pi'o`.ision 'tor mounting my iniproved switch in anorcinnary soci-:et appears vin Athe npper threaded plug 7S and centrecontact Til which are electrically connected respectively with bra :ketsl-land l ln; screw SO and by the screw Si, re rj plate Si?, and screw 83respectively, it being` noted, however, that in its entirety theadvanta- `cous switch arrargement which l nave invented and hereindescribed is as readily capable of embot nnent in a fixture orpern'ianent type et socket, or a pendant pull as in the adapter type oflamp i The iasme; T6, i iay be extended in bell torni to serve as shadeholdswitch, etc.,

or as sl .oin in Fig'. r.lhe ii-ature residing' in the thermostaticcoinrol mechanism 50, 45, tl, 43, 4t2, etc. pei

', is not claimed in this applicatioin but i D subyect matter of claimsin my vtwo coimdiigl applications, Serial No. 421,556, id lloveinber 3,192() and Serial No. V'l2-l.-

' ieveinber S, 1920. Neither Vis the siding in the arrangement ot conl,34! etc. relative to the rotor in combination with the resiritaice 53,5l, etc. claimed in this apl the subject matter et claims i Patent No.'lJGSlL i rcs ling' in the consti' ictio: n.51' ot the resistance unit5l, 5i?, se is not claimed in this The above,

he exact, as herein disclos and many other moditieations embodiment etmy invention d, may be readily made and without intention, therefore, otlimiting the scope oi the invention to such exact embodin'rent, what lclaim new is:

1. A pull socket switch structure embodying, in con'ibination, a lampreceptacle; means to dim the lamp; a controlling switch: and a deviceoperativelftf related to said switch, electrically governed thereby,

and adapted when electrically energized to cause delayedcircuita-breaking switch Inovement to extinguish the lamp; together withmanual actiating means tor establishing selective operative positions otsaid switch whereby the lamp may respectively be fully lighted1 dimmed,or auton'iatically extinguished a substantial period of time aftermanual actuation of said switch to energize said device.

2. A socket switch having three elements 'to be energized, andcomprising in combination; a plug receptacle to receive an electricaldevice; a resistance; and means operative, when electri-.ally energized,to cause :'.utoiuatic controlling movement of a contained switch; andcontained switch mechanism including differently positioned stationarycontacts for a circuit to energize said plug receptacle and resistancein series, and tor a circuit to energize said means simultaneously withone of said last mentioned two circuits; together with a single,manually-actual'ile movable governing element whereby eitha' of saidthree circuits m y selectively he connected to the supply circuit.

3. ik seit-contained socket switch structure including a`current-governing switch and three translative devices to be governedthereby, comprising respectively a current tap receptacle, a resistancand electricallyoperable automatic means for causing delayed circuit`governing actuation o't said switch; the said switch having a nioy'able current distribntm' and co-operative stationary contactsconnected as terminals respectively for a circuit containing saidreceptacle alone, and for a circuit containing said receptacle and saidmeans, whereby J"nrongh movements et said distrilnitor said rcuits mayselectively be supplied with irrent.

a. A self-contained socket switch strnctnrc adapted tor connection to asupply circuit and having three electrical translativc devices to besupplied with currenty from said circuit comprising a tap receptacle; aresistaiice; and electricaltv-controlled means operative, when energizedto cause the autoniatic disconnection ot said receptacle trom the supplycircuit; together with a contained switch mechanism tor governing thesupply oli current to said devices and embodying a movable, coinluctivedistributor adapted to be manually actuated. and separate stationarycontacts arranged to be conductively engaged respectively by saiddistributor in different positions of the latter and electricallyconnected when so engaged to energize either said receptacle alone, saidreceptacle and said resistance in series, or said receptacle togetherwith saine means.

5. A pull socket switch structure includlll) ing)r a current governingswitch and three translativc devices to be governed tl'iereby,comprising' respectively a current tap receptacle; a resistance; andelectricalijf-operable means tor causin automatic circuit-governin eactuation ov a contained switch; the said switch incliulinaer a rotatclcurrent distributor, a spring returned l r driving' element having#pawl-and-ratc encrage- 1elv adhet ment with said distributor or rotativvancingr the later in pron'rcssiv f-rtatcs ot movement, detent meansarrriiignnr o restrict retrogressive movement ot said listrilnitor, dthe path and stationary contacts arrany'ed ot said distributor and co-.r minals respectively 'for a circuit cont said receptacle alone, Yfor acirc i ing' said receptacle and said rei. tr e in series`r and for acircuit containi Lf said receptacle and said electrically operablemeans; together with a pull chain tor manually actuating@- said driving;ele*l ent., wherebj,v said distributor may beV selectively establishedin different positions for selectively energizing said circuitsrespectively.

6. .A gull socket switch structure including); a current-governing'switch and thre, electrical load devices to be governed thereby,comprising; respectively a current tap receptacle; a resistance; andelectrically-operable means for causing` automatic circuit-n'overninn'actuation ot said switcln-the said switch including' a rotatable currentdistributor, a spring-returned oscillatory driving;` element having;`pawl-and-ratchet engagement "v 'th said distributor whereby successive'lull strokes of said element advance said distributor in itull stagesot rotative moveme dctent means to restri yt retrogressive novements oicsaid distriluitor5 and sepai ate stationary contacts arranged in thepath ot said distributor-and electrically connected as terminals resaectively tor a. circuit containing; said receptacle`r a circuitcontaining` said yreceptacle and said resistance in series, and tor acircuit containing said receptacle and said means; said stationarycontacts tor a iVv spaced within a full stage or movement ot saiddistributor, whereby a single stroke of said element is operativeselectively to control a plurality ot said circuits,

i. A self-contained socket switch structure including aycurrent-governiugr switch and the rotor pivot from said supply-connectedcontact the said separate contacts beineconnected as terminalsrespectively for a circuit containing said receptacle alone, for acircuit containing` said receptacle and said means, whereinv the supplyot current to said circuits may be selectively7 established through theconductive bridaine` by said rotor of said supply-connected contact andselected inembcrs of said separate contacts.

8. l pull socket switch structure adapted 'for supply circuit connectionand including a lamp receptacle; a lamp dimming; resistance;electrically-operable means adapted automatically to cut out saidreceptacle from the supply circuit; and conta-ined switch mechanismembodying` arotatable current switchine` m i mber having' twodiametrically opposite contact wiping' arms; a rotatively oscillatoisprin ;-returncd7 pull-operated driving ment having,v stop means tolimit the otative stroke thereof, and having pawl and latchet engagementwith said member, where-bv successive 'lull strokes of said segmentcause tull rotative advance movements ot' said member; circularlypositioned incined deteut rteps arranged about said end ot said pivot inthe rotative path ot said wiper arms and terminating` respectively ininsu ating' shoulders for preventing;` retro- ;rcssive movement ot saidarms between seps; sparate contact plates carried on the inclineportions ot said detent steps to cooperate with said curreut-switchingmember and electrically connected as terminals .respectively tor oneside ot the supply circuit, a load circuit containing? said receptaclene, Ytor a load circuit containing said rcceptacle and said resistancein series7 and tor load circuit cont ininasaid receptacle and saidelect- 'ically-olfierablc means, said contact plates beineY soconsecutively spaced that more than one ot said load-circuit contactplates is traversed by a wiper arm during a lull advance movement otsaid member, whereby partial and full strokes ot said-senment establishconnection ot' respectively dit'- terent load circuits to the supplycircuit.

9, lu a thermostatically-controlled, lampdimmingf socret switchstructure, embodying` a movable switch contact member and meanstensioning` the same tor current tively traversed by said member ,torswitching the current; and circuit connections between said leadterminals, said receptacle, said resistance,said device, and saidcontacts, so arranged that in different positions, said member isoperative to establish the energization of said receptacle, saidresistance and said device respectively in selective and differentelectrical relations,

l0. A currentsupplied socket switch structure embodying in combination;a receptacle for an incandescent lamp; a structure-contained resistanceunit for dimming said lamp; a lamp-governing switch with an electricallyenergizable device normally operative to delay lamp-extinguishing,circuitbreaking action oit said switch; and common manualswitch-operating means for tensioning said switch automatically toeffect said circuit-breaking action, and for operatively energizing saiddevice ;-the said switch including a manually actuable currentswitchingmember, and co-operative separate contacts arranged to be electricallyconnected in variable relation to the supply circuit in diiiierentpositions of said member, together with circuit connections between saidcontacts and said receptacle, unit, and device respectively so arrangedthat in one position ot' said member said lamp alone is energized. inanother position of said member said lamp and said unit are energized inseries, and in a different position ot said member,

r said lamp and said device are together energized. whereby automaticdelayed extinguishment of said lamp is effected.

11. A socket switch having a lamp; a resistance for dimming said lamp;and automaticelectrically-governable means to cause the delayed cut-oft`of current to said lamp g-together with a switch embodying separatecontacts governing three circuits respectively containing said lamp,resistance and means, and a (3o-operative manually movable circuitcontroller arranged by a First movement thereof to energize said lamp inseries with said resistance, by a second movement thereof to energizesaid lamp alone, and by a third movement thereofl to energize said meanstogether with said lamp, thereby to cause the said delayed cut-olf ofcurrent to said lamp.

1Q. In a pull socket for an incandescent lamp; means to dim the lamp; acurrent-supplied switch including a current-distributing rotor andco-operative contacts arranged to govern the energization of said lampand said means; a device electrically governed by said switch,operatively related thereto mechanically, and adapted when energized tocause delayed automatic lamp-extinguishing actuation of said switch; andcircuit connections to said switch contacts` and to said receptacle`said means, and said device, respectively.l whereby said lat-ter threeparts are energizable in variable combinations by said switch, togetherwith a manually-actuable spring-returned` recii'irocative drivingelement arranged to rotate said rotor through a single and a doublestage of movement respectively by partial and lull strokes thereof, thearrangement of said eo-operating contacts being such that successivefull strokes oli said element position said rotor alternately to lightand extinguish the lamp, and further so that partial strokes ot' saidclement operate respectively to dim the lamp and to cause delayedautomatic extinguishment thereof. i

13, An incandescent lamp socket? structure adapted for connection to asupply circuit and incorporating, in self-contained form,- a lampreceptacle; two separate resistance units; and a switch arranged togovern the connection to the supply circuit respectively ot saidreceptacle alone, and of said receptacle in series with either of saidtwo resistance units,-one of said units being arranged solely to dim thelamp; together with means including the other of said units operativewhen energized to cause automatic current switching actuation of saidswitch.

14. A pull socket switch structure embodying, in combination; a lampreceptacle; means to dim the lamp; a controlling switch; a deviceoperatively related to said switch, electrically governed thereby, andadapted when electrically energized to cause delayed automatic switchmovement to vary the supply of current to the lamp; together with manualactuating means for establishing selective operative positions of saidswitch, whereby the lamp may respectively be lighter. dimmed orextinguished; said device being arranged to be rendered operative bymovement of said manual actuating means subsequent to a movementthereotl that establishes the switch in one ot its said operativepositions.

l5. In a pull-chain` lamp-socket switch adapted to be operated bysuccessive actuations of a controlling pull chain and incorporatingagencies operative to dim the.

lamp and also to delay lamp extinguishment, means whereby said pullchain may be actuated at will to light the lamp, to dim the same or toset in operation said delayed action extinguishment agencies.

1G. In a pull-chain, lamp-socket switch adapted to be operated bysuccessive actuations of a controlling pull chain, and incorporatingagencies to dim the lamp and also to delay circuit breaking movement ofthe switch, means whereby said pull chain may be actuated at will tolight the lamp, to dim the same, or to establish the switch under thecontrol of said delayed action agencies, or to move the switch directlyto break the circuit without delay.

i?, ln a pull-chain, lamp socket switch,

the combination with pull chain control means of automatic mechanism tocause selt` delayed lamp eXt-inguishment, circuits operativerespectively to produce relatively high or low candlepower illuminationand means whereby said control means may be actuated to establish atwill said circuits tor either relatively high or low illumination or tocause self delayed lamp extinguishment.

18. ln a pull-chain, lamp socket switch, the combination with pull chaincontrol means of automatic mechanism to cause self delayed lampextinguishment, circuits operative respectively to produce relativelyhigh or low candle-power illumination and means whereby said controlmeans may be actuated to establish at will said circuits for eitherrelatively high or low illumination or to cause self delayed lampextingushment, or to move the switch directly tor lamp extinguishmentwithout delay.

19. In an electric light switch, the combina-tion with circuitsoperative to produce either relatively high or low candle-powerillumination, of controlling means to establish or break said circuitsat will and means also set into operation by said controllingmeansautomatically to delay lamp eX- tinpguishment for a substantialinterval.

20. ln an electric light switch, the combination with circuits operativeto produce either relatively high or low candle-power illumination, ofcontrolling means to estvblish or break said circuits at will and meansalso set into operation by said controlling' means automatically todela),Y lamp extinguishment for a substantial interval, said controllingmeans being' also operable at will to cause lamp extinguishment directlywithout said interval ot delay.

Signed at Boston, in the county of Sur'- ollr and Commonwealth olfMassachusetts, this 25th. day of October, 1920.

RAYMOND D. SMITH.

lVit-nesses SILVIO AnroRoso, JOHN CROWLEY.

